Jetting Specifications

We have developed a list of jetting specifications that we believe will help your bike run its very best. Please remember that sometimes the stock OEM jetting will work just fine, other times you may have to make an adjustment, so use our suggestions below as a guide to help with your jetting problem.


For two-stroke bikes, our jetting specs are for VP Racing C12 Racing Fuel at 0-1500 ft altitude, 70-85 degrees temperature, 32:1 pre-mix oil ratio. We recommend Maxima Castor 927 High Performance 2-Cycle Oil.


For four-stroke bikes, our jetting specs are for premium pump gas at 0-1500 ft altitude at 70-85 degrees temperature.


Please Note: The stock OEM jetting for your specific model is listed first, followed by our recommended jetting underneath that model.


 

 

 
2024
2023
2022
2021
2020
2019
2018 2017
2016
2015
2014
2013
2012
2011
2010 2009
2008
2007
2006
2005
2004
2003
2002 2001
2000
1999
1998
1997
1996
1995
1994 1993
1992
1991
1990
1989-1984
ATV
2024
Model
Main
Pilot
Needle
Pos
Screw
Power
Slide
Nozzle
Leak
Other
Honda
CRF150R
138
38
NMQS
3
2.5
 
1.5
 
58
Pro Circuit
138
45
NMQS
3
2.5
1.5
58
Yamaha
YZ65
142
45
NAPF
2
2.5
 
 
  
 
PC MRX02
142
48
NAPF
3
2.5
 
 
  
 
YZ85
138
45
NBKF
2
2.25
 
 
  
 
PC MRX02
145
45
NAPG
3
2
 
 
 
 
PC YZ112
135
42
NBKF
2
2
 
 
 
 
YZ125
160
72
NYEF
2
2.75
35
 
 
 
PC MRX02/C12
165
62
Y4
2
1.5-2
 70
 
 
  
TTR125
105
15
 
 
 
  
 
 
  
Pro Circuit
107.5
15
Stock
3
1.75
  
 
 
  
YZ250
178
50
N3EW
 
 
  
Pro Circuit
 
 
Kawasaki
KX65
190
25
5GSP68
3
1.5
 
 
 
 
Pro Circuit
200
27.5
5GSP68
2
1.5
 
 
 
 
MRX02
210
30
5GSP68
3
1.5
 
 
 
 
KX85
140
38
NRJC
3
1.5
 
 
  
 
Pro Circuit
142
45
NAPE
3
2
 
 
 
 
Mammoth
140
42
NAPE
2
2
 
 
 
 
VP C12
140
42
NAPE
3
1.5
 
 
 
 
VP110
142
45
NAPE
3
1.5
 
 
 
 
MRX02
145
45
NAPE
3
1.5
 
 
 
 
KX112
148
42
NRKC
3 
1.5
 
 
 
 
MRX02
145
42
NAPD
2 
1.5
 
 
 
 
Pro Circuit
142
42
NAPD
2 
1.5
 
 
 
 
KTM
KTM 50 SX
 
 
 
 
 
 
 
 
 
Pro Circuit
 
 
 
 
 
 
 
 
 
KTM 65 SX
 
 
 
 
Pro Circuit
 
 
 
 
 
 
 
 
 
KTM 85 SX
145
48
NRKC
2
1.5
 
 
 
 
Pro Circuit
142
45
NRKC
2
1.75
 
 
 
 
KTM112 PC
148
48
NRjC
2
1.5
 
 
 
 
MRX02
 
 
 
 
 
 
 
 
 
Cobra
CX 50 JR
55
92
W-7
3
1.5
 
 
Pro Circuit
 
 
CX 50 SR
55
93
W-7
2
1.5
 
 
Pro Circuit
 
 
 
 
 
 
 
CX 50 FWE
55
93
W-7
2
1.5
 
 
 
 
 
CX 65
280
42.5
5I14-4
2
 
 
 
 
 
 
Pro Circuit
 
 
 
 
 
 
Husqvarna
TC 65
 
 
 
 
 
 
 
 
 
 
PC MRX02
 
 
 
 
 

 

2023
Model
Main
Pilot
Needle
Pos
Screw
Power
Slide
Nozzle
Leak
Other
Honda
CRF150R
138
38
NMQS
3
2.5
 
 
Pro Circuit
138
45
NMQS
3
2.5
Yamaha
YZ65
142
45
NAPF
2
2.5
 
 
  
 
PC MRX02
142
48
NAPF
3
2.5
 
 
  
 
YZ85
138
45
NBKF
2
2.5
 
 
  
 
PC MRX02
145
45
NAPG
3
2
 
 
 
 
PC YZ112
135
42
NBKF
2
2
 
 
 
 
YZ125
160
72
NYEF
2
2.75
35
 
 
 
Pro Circuit
165
62
Y4
2
1.5-2
 70
 
 
  
TTR125
105
15
 
 
  
 
 
  
Pro Circuit
107.5
15
Stock
3
1.75
  
 
 
  
YZ250
178
50
N3EW
2
1
50
 
 
  
Pro Circuit
175
48
N3EW
2
1
50
7.0
 
 
Suzuki
RM85
125
50
NAAH
2
2
 
 
 
 
Pro Circuit
125
48
NAAH
2
2
 
 
 
 
PC RM112
125
48
NAAH
2
2
 
 
 
 
Kawasaki
KX65
190
25
5GSP68
3
1.5
 
 
 
 
Pro Circuit
200
27.5
5GSP68
2
1.5
 
 
 
 
MRX02
210
30
5GSP68
3
1.5
 
 
 
 
KX85
140
38
NRJC
3
1.5
 
 
  
 
Pro Circuit
142
45
NAPE
3
2
 
 
 
 
Mammoth
140
42
NAPE
2
2
 
 
 
 
VP C12
140
42
NAPE
3
1.5
 
 
 
 
VP110
142
45
NAPE
3
1.5
 
 
 
 
MRX02
145
45
NAPE
3
1.5
 
 
 
 
KX112
148
42
NRKC
3 
1.5
 
 
 
 
MRX02
145
42
NAPD
2 
1.5
 
 
 
 
Pro Circuit
142
42
NAPD
2 
1.5
 
 
 
 
KTM
KTM 50 SX
85
58
26UAU
3 
3
 
 
 
 
Pro Circuit
 
 
 
 
 
KTM 65 SX
210
15
51PL43
Top
3.5
 
 
 
 
Pro Circuit
210
20
51PL43
2 
3.5
 
 
 
 
KTM 85 SX
145
48
NRKC
2
1.5
 
 
 
 
Pro Circuit
142
45
NRKC
2
1.75
 
 
 
 
KTM112 PC
148
48
NRJC
2
1.5
 
 
 
 
MRX02
 
 
 
 
 
 
 
 
 
Cobra
CX 50 JR
55
92
W-7
3
1.5
 
 
 
 
 
Pro Circuit
 
 
 
 
 
 
 
 
 
 
CX 50 SR
55
93
W-7
2
1.5
 
 
 
 
 
Pro Circuit
 
 
 
 
 
 
 
CX 65
280
42.5
5I14-4
4
2
 
 
 
 
 
Pro Circuit
 
 
 
 
 
 
Husqvarna
TC 65
210
15
51PL43
1
3.5
 
 
 
 
 
PC MRX02
210
20
51PL43
2
3.5
 
 
 
 
 





 

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